19967220819 has 48 divisors (see below), whose sum is σ = 36812036352. Its totient is φ = 10532148768.

The previous prime is 19967220787. The next prime is 19967220827. The reversal of 19967220819 is 91802276991.

It is not a de Polignac number, because 19967220819 - 2⁵ = 19967220787 is a prime.

It is a super-2 number, since 2×19967220819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19967220019) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 429369 + ... + 473594.

It is an arithmetic number, because the mean of its divisors is an integer number (766917424).

Almost surely, 2^19967220819 is an apocalyptic number.

19967220819 is a deficient number, since it is larger than the sum of its proper divisors (16844815533).

19967220819 is an equidigital number, since it uses as much as digits as its factorization.

19967220819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902998 (or 902986 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The spelling of 19967220819 in words is "nineteen billion, nine hundred sixty-seven million, two hundred twenty thousand, eight hundred nineteen".